diff --git a/presets/nes/apu.h b/presets/nes/apu.h
index 3dc38bfd..2d3110e2 100644
--- a/presets/nes/apu.h
+++ b/presets/nes/apu.h
@@ -40,9 +40,12 @@
   APU.pulse[channel].len_period_high = (((period)>>8)&7);\
   APU.pulse[channel].control = (duty) | (vol) | (PULSE_CONSTVOL|PULSE_ENVLOOP);
 
-#define APU_PULSE_CONTROL(channel,duty,decay)\
+#define APU_PULSE_SET_DECAY(channel,duty,decay)\
   APU.pulse[channel].control = (duty) | (decay);
 
+#define APU_PULSE_SET_VOLUME(channel,duty,vol)\
+  APU.pulse[channel].control = (duty) | (vol) | (PULSE_CONSTVOL|PULSE_ENVLOOP);
+
 #define APU_PULSE_SWEEP(channel,period,shift,up)\
   APU.pulse[channel].ramp = 0x80 | (period<<4) | (up?8:0) | shift;
 
diff --git a/presets/nes/shoot2.c b/presets/nes/shoot2.c
index bcb22e7f..d106bdc1 100644
--- a/presets/nes/shoot2.c
+++ b/presets/nes/shoot2.c
@@ -626,9 +626,9 @@ void set_sounds() {
   byte enable = ENABLE_PULSE0|ENABLE_PULSE1|ENABLE_NOISE;
   // missile fire sound
   if (missiles[PLYRMISSILE].ypos != YOFFSCREEN) {
-    APU_PULSE_SUSTAIN(0, missiles[PLYRMISSILE].ypos ^ 0xff, DUTY_50, 6);
+    APU_PULSE_SUSTAIN(0, 255-missiles[PLYRMISSILE].ypos, DUTY_50, 6);
   } else {
-    APU_PULSE_CONTROL(0, DUTY_50, 1);
+    APU_PULSE_SET_VOLUME(0, DUTY_50, 0);
   }
   // enemy explosion sound
   if (player_exploding && player_exploding < 8) {
@@ -643,6 +643,7 @@ void set_sounds() {
       byte y = a->y >> 8;
       APU_TRIANGLE_SUSTAIN(0x100 | y);
       enable |= ENABLE_TRIANGLE;
+      break;
     }
   }
   APU_ENABLE(enable);
diff --git a/presets/nes/siegegame.c b/presets/nes/siegegame.c
index bca8ced7..a4690371 100644
--- a/presets/nes/siegegame.c
+++ b/presets/nes/siegegame.c
@@ -26,7 +26,7 @@ byte getchar(byte x, byte y) {
   word addr = NTADR_A(x,y);
   byte rd;
   // wait for VBLANK to start
-  ppu_wait_frame();
+  ppu_wait_nmi();
   // set vram address and read byte
   vram_adr(addr);
   vram_read(&rd, 1);
@@ -116,8 +116,8 @@ void init_game() {
   memset(players, 0, sizeof(players));
   players[0].head_attr = '1';
   players[1].head_attr = '2';
-  players[0].tail_attr = '#';
-  players[1].tail_attr = '*';
+  players[0].tail_attr = 0x06;
+  players[1].tail_attr = 0x07;
   frames_per_move = START_SPEED;
 }
 
@@ -167,7 +167,7 @@ byte ai_try_dir(Player* p, dir_t dir, byte shift) {
   dir &= 3;
   x = p->x + (DIR_X[dir] << shift);
   y = p->y + (DIR_Y[dir] << shift);
-  if (x < COLS && y < ROWS && getchar(x, y) == ' ') {
+  if (x < COLS && y < ROWS && getchar(x, y) == 0) {
     p->dir = dir;
     return 1;
   } else {
@@ -251,10 +251,11 @@ AE(1,1,1,1),AE(1,1,1,1),AE(1,1,1,1),AE(1,1,1,1), AE(1,1,1,1),AE(1,1,1,1),AE(1,1,
 
 /*{pal:"nes",layout:"nes"}*/
 const unsigned char Palette_Table[16]={ 
-  0x02,
-  0x31,0x31,0x31,0x00,
-  0x34,0x34,0x34,0x00,
-  0x39,0x39,0x39,0x00,
+  0x00,
+  0x01,0x28,0x31,0x00,
+  0x04,0x24,0x34,0x00,
+  0x09,0x29,0x39,0x00,
+  0x06,0x26,0x36
 };
 
 // put 8x8 grid of palette entries into the PPU
@@ -266,7 +267,7 @@ void setup_attrib_table() {
 void setup_palette() {
   int i;
   // only set palette entries 0-15 (background only)
-  for (i=0; i<15; i++)
+  for (i=0; i<16; i++)
     pal_col(i, Palette_Table[i] ^ attract);
 }
 
diff --git a/src/platform/nes.ts b/src/platform/nes.ts
index 5370b1ac..44cae22f 100644
--- a/src/platform/nes.ts
+++ b/src/platform/nes.ts
@@ -9,12 +9,7 @@ import { SampleAudio } from "../audio";
 declare var jsnes : any;
 
 const JSNES_PRESETS = [
-  {id:'ex0.asm', name:'Initialization (ASM)'},
-  {id:'ex1.asm', name:'Hello World (ASM)'},
-  {id:'ex2.asm', name:'Scrolling Demo (ASM)'},
-  {id:'ex3.asm', name:'Sprite Demo (ASM)'},
-  {id:'ex4.asm', name:'Controller Demo (ASM)'},
-  {id:'hello.c', name:'Text'},
+  {id:'hello.c', name:'Hello World'},
   {id:'scroll.c', name:'Scrolling'},
   {id:'vrambuffer.c', name:'VRAM Buffer'},
   {id:'sprites.c', name:'Sprites'},
@@ -32,9 +27,14 @@ const JSNES_PRESETS = [
   {id:'shoot2.c', name:'Solarian Game'},
   {id:'climber.c', name:'Platform Game'},
   {id:'fami.c', name:'Famitone Demo'},
-  {id:'musicdemo.asm', name:'Famitone Demo (ASM)'},
   {id:'bankswitch.c', name:'Bank Switching'},
   {id:'irq.c', name:'IRQ Scanline Counter'},
+  {id:'ex0.asm', name:'Initialization (ASM)'},
+  {id:'ex1.asm', name:'Hello World (ASM)'},
+  {id:'ex2.asm', name:'Scrolling Demo (ASM)'},
+  {id:'ex3.asm', name:'Sprite Demo (ASM)'},
+  {id:'ex4.asm', name:'Controller Demo (ASM)'},
+  {id:'musicdemo.asm', name:'Famitone Demo (ASM)'},
   {id:'scrollrt.asm', name:'Line-by-line Scrolling (ASM)'},
   {id:'xyscroll.asm', name:'XY Split Scrolling (ASM)'},
 ];
diff --git a/src/ui.ts b/src/ui.ts
index b880f594..3c617547 100644
--- a/src/ui.ts
+++ b/src/ui.ts
@@ -286,14 +286,19 @@ function getSkeletonFile(fileid:string, callback) {
   });
 }
 
+function checkEnteredFilename(fn : string) : boolean {
+  if (fn.indexOf(" ") >= 0) {
+    alert("No spaces in filenames, please.");
+    return false;
+  }
+  return true;
+}
+
 function _createNewFile(e) {
   // TODO: support spaces
   var filename = prompt("Create New File", "newfile" + platform.getDefaultExtension());
   if (filename && filename.trim().length > 0) {
-    if (filename.indexOf(" ") >= 0) {
-      alert("No spaces, please.");
-      return;
-    }
+    if (!checkEnteredFilename(filename)) return;
     if (filename.indexOf(".") < 0) {
       filename += platform.getDefaultExtension();
     }
@@ -526,6 +531,7 @@ function _renameFile(e) {
     var newfn = prompt("Rename '" + fn + "' to?", fn);
     var data = current_project.getFile(wnd.getPath());
     if (newfn && data && newfn.startsWith("local/")) {
+      if (!checkEnteredFilename(newfn)) return;
       store.removeItem(fn, () => {
         store.setItem(newfn, data, () => {
           alert("Renamed " + fn + " to " + newfn);
@@ -1028,6 +1034,7 @@ function addFileToProject(type, ext, linefn) {
   if (wnd && wnd.insertText) {
     var filename = prompt("Add "+type+" File to Project", "filename"+ext);
     if (filename && filename.trim().length > 0) {
+      if (!checkEnteredFilename(filename)) return;
       var path = "local/" + filename;
       var newline = "\n" + linefn(filename) + "\n";
       current_project.loadFiles([path], (err, result) => {